Removing a sample of lymph node tissue for testing. Your doctor may recommend a biopsy procedure to sample or remove a lymph node for testing. Analyzing lymph node tissue in a lab may reveal whether you have non-Hodgkin's lymphoma and, if so, which type.

Looking for cancer cells in your bone marrow. To find out whether the disease affects your bone marrow, your doctor may request a bone marrow biopsy. This involves inserting a needle into your pelvic bone to obtain a sample of bone marrow.

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